WTL links
Definition taken from Wikipedia 
The Windows Template Library (WTL) is a free software, object-oriented C++ template library for Win32 development. WTL was created by Microsoft employee Nenad Stefanovic for internal use and later released as an unsupported add-on to Visual Studio and the Win32 Framework SDK. It was developed primarily as a light-weight alternative to the Microsoft Foundation Classes and builds upon Microsoft's ATL, another lightweight API widely used to create COM and ActiveX libraries.
As the subject says, this post only contains useful links about this wonderful library:
Home of WTL in Sorceforge
WTL download from Microsoft download center
WTL on CodeProject - If you're an MFC programmer, check the series WTL for MFC programmers.
GameDev.NET - Using the Windows Template Library part 1
GameDev.NET - Using the Windows Template Library part 2
WTL Wiki
Chris Sells's WTL Makes UI Programming a Joy, Part 1: The Basics
Chris Sells's WTL Makes UI Programming a Joy Part 2: The Bells and Whistles
vicsoe.dk WTL samples
I've also attached the Clipcode's WTL developer's guide ebook (the original link seems to be down at the moment)
Finally, don't forget to join the WTL User Group